irmin.patch

diff --git a/bench/irmin-pack/dune b/bench/irmin-pack/dune
index b9e53548d..f773ba3ac 100644
--- a/bench/irmin-pack/dune
+++ b/bench/irmin-pack/dune
@@ -6,7 +6,7 @@
  (preprocess
   (pps ppx_repr))
  (libraries irmin-pack irmin-pack.layered irmin-test.bench irmin-layers lwt
-   unix cmdliner logs memtrace repr ppx_repr bench_common rusage))
+   unix cmdliner logs memtrace repr ppx_repr bench_common rusage opsian))
 
 (library
  (name bench_common)
@@ -30,12 +30,12 @@
   (pps ppx_repr))
  (libraries irmin-pack irmin-pack.layered irmin-pack.mem irmin-test.bench
    irmin-layers lwt unix cmdliner logs memtrace repr ppx_repr bench_common
-   tezos-context-hash-irmin irmin_traces))
+   tezos-context-hash-irmin irmin_traces opsian))
 
 (executable
  (name trace_stats)
  (modules trace_stats)
- (libraries cmdliner irmin_traces))
+ (libraries cmdliner irmin_traces opsian))
 
 ;; Require the executables to compile during tests